feat(schema): Add JSON schema for ORT project files

[MarcelBochtler]

In order to get auto-completions and validation in editors, provide a JSON schema for the ORT project file.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.98%. Comparing base (6df9647) to head (781ce3e).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #11547   +/-   ##
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  Coverage     57.98%   57.98%           
  Complexity     1730     1730           
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  Files           349      349           
  Lines         12994    12994           
  Branches       1263     1263           
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  Hits           7534     7534           
  Misses         4995     4995           
  Partials        465      465           

Flag	Coverage Δ
funTest-external-tools	14.18% <ø> (ø)
test-ubuntu-24.04	42.56% <ø> (ø)
test-windows-2025	42.53% <ø> (ø)

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[sschuberth]

If we add the schema, I think we should also have a way to auto-generate it from the model classes (similar to like this script does that for the ORT result).

The difference here is that OrtProjectFileDto uses KxS instead of Jackson, so not exactly the same approach as in the above-mentioned script can be used. But there are several solutions for KxS as well, like https://github.com/Kotlin/kotlinx-schema, https://github.com/SMILEY4/schema-kenerator, or https://github.com/pwall567/json-kotlin-schema-codegen.